Die for forming augers



(No Model.) 2 Sheets-Sheet 1.

S. A. LEONARD.

DIE FOR FORMING AUGERS. No. 440,484. Patented Nov. 11, 1890..

(No Model.) 2 Sheets-Sheet 2.

S. A. LEONARD. DIE FOR FORMING AUGERS.

No. 440,484. Patented Nov. 11, 1890.

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UNITED STATES PATENT OFFICE.

SETH A. LEONARD, OF PHILADELPHIA, PENNSYLVANIA.

DIE FOR FORMING AUGERSA.

SPECIFICATION forming part of Letters Patent No. 440,484, dated November 11,1890.

Application filed October 19, 1889. Serial No. 327,560- (No model.) I

To all whom it may concern:

Be it known that I, SETH A. LEONARD, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Dies for Forming the Heads of Angers and Bits, of which the following is a specification.

The object of my invention is to so construct the dies used in forming the heads of augers and bits that asimple two part die can be used with a plunger.

Heretofore it has been the general practice to finish the head of the auger with the under lip by hand, cutting out the portion bound by the cutting-edge and under lip, the dies merely forming a solid end, as it would be impossible in the ordinary construction of two-part dies to remove the formed auger after the under lip has been formed thereon. I overcome these difficulties in the following manner, reference being had to the accompanying drawings, in which- Figure 1 is a perspective view showing the two dies separated. Fig. 2 is a plan View of the dies together. Fig. 3 is aface view of one of the dies. Figs. 4, 5, and 6 are views of the plunger. Figs. 7 and 8 are diagrams illustrating the formation of an under-lip anger or bit where power is used. Figs. 9, 10, and 11 are Views illustrating the formation of the under-lip anger or hit by hand. Fig. 12 is a vertical section of a different form of die embodying-my invention; Fig. 13, a plan view of the die shown. Fig. 14 is a diagram view showing the formation of the spur of the bit. Fig. 15 is a side View of the head of an underlip auger, and Fig. 16 is a side view of the head of a spur-bit.

Referring to Figs. 1, 2, and 3, A and B are the two dies forming the two part mold. These dies have each a semicircular orifice a, and in these orifices are raised spiral ribs 11, one half of the spiral being in one die and the other in the other die.

The die A has a seat 0, preferably cut beveled, as shown in Fig. 3, and adapted to this seat is the projecting anvil-horn cl of the die B. This horn projects into the die A and is supported by the seat 0, so that when pressure is applied to force the metal forming the under lip of the auger over this anvil-horn the seat 0 will sustain the thrust and will prevent the horn from breaking.

On the side of the die A opposite to the seat 0 is a horn 51, similar in form to and in. fact a duplicate of the horn d of the die B. This horn extends into the die B, and is sup ported by the seat a, (clearly shown in Fig. 1,) and the lip opposite to that turned over the anvil-horn d is turned over this anvil-horn d. When the two dies are together, as shown in Figs. 2, 6, and 7, a space 6 is formed between each of the horns d d and the dies A and B, and in the space care forced by pressure the under lips of the auger.

If the anvil-horn d,instead of projecting from the die B, as shown, formed a permanent part of the die A, the space e would be formed, but when the auger was struck up in said die so as to form an under lip it could not be removed therefrom, as the auger, owing to its peculiar shape, has to be removed outward from the face of the die, it being confined longitudinally, so that any lip or projectionsuch as the under lip-would prevent the removal of the auger, and it is to overcome this objection that I form an anvil-horn on each die and allow it to extend into the other die, as shown.

In Figs. 4, 5,and 6 I have shown the plunger used in connection with the dies to force the prepared bit into the proper shape, as shown in the diagrams in Figs. 7 and B. This plunger D has two inclined faces ff of an incline corresponding to that of the twist of the finished bit, and also has two vertical edges 9 g and an orifice 4 for the formation of the point of the bit. The plunger is so mounted in respect to the dies that the points it are at right angles to the parting-line of the dies. Previous to my invention these points were on the same line as the parting-line of the dies, and consequently when the old style solid head bit was formed the metal was crowded into the corner of the plunger formed by the vertical faces and inclined faces to such a degree that these corners of the plunger would invariably break off and become useless, but by so setting the plunger in respect to the dies that the thrust is taken on the portion a; a: of the die and the lateral flow of metal is not checked by any projection this continual breaking of the plunger is prevented.

I have illustrated by two diagrams, Figs. 7 and 8, the formation of an under-lip auger. The auger-blank M is placed in the dies, as shown in Fig. 7, the head on of the blank M being out into the shape shown inFig. 7, and

.said figure, the under lips 01 are bent over the a anvil-horns d (1', so that it will-be impossible to form on thetwo-part die these under lips without the projecting anvil-horns.

To form a spur-bit or extension cutting-edge on abit, the plunger is cut-out at k Fig. 14..

The metal as it is compressed willfiowninto this space It" and form a spur, asshown at m,

.. Fig. 16.

' A diiferentform of blank may beused fromthat shown in Figs. '7' and 8-for inaking-the auger or bit as,'for instance, ablank may be' used as shown in Figs. 9 and 12, the portion n',which will form the under lip, extendi-ing beyond the peripheral line of the augerblank, and by cutting passages s sin the dies A B at: the points "indicated in Fig. 13. and Securing to the plunger D arms D, preferably with rounded ends, which are adapted to these passages s s. in the-die, asshown in Fig. 12, with the pro- The blank can be placed 'jecting portion at in the space 8, so thaton the depression of the die D with the arms D the arms willv bend over the portions nyforming the under lip of theauger over the anvilhorns cl d, the die shaping the head and point of the auger.

" Where it isimpossible to use powerful pressure that would be necessarily employed in forming the head of the anger or bit, I. form w the dies as shown in Figs. 9,10, and 11. The

die A, instead of being situated vertically, as preferred in theother form of die illustrated, I mount preferably horizontally, and use the 1 plunger D to shape the head of the blank M, which is of the shapeshown in Fig. 9, that the end n projects beyond the peripheral line ofthe blank.

' The die A, instead of extending as shown 1 in Fig. 1, is'cut'away, forming a recess 8, the

die B'forming one side of said recess and the portions a 0. formingthe other sides.

' stantially in the manner shown in the figure The horn d projects into. the die A subabove alluded to; but instead of-turning both lips of the auger simultaneously one lip is turned at a time, the horn d'beingmerely used as a supporting-horn in this instance,

and may in some instances be dispensed with. A cavity 1) in the die is of such a shape as to receive the lip or extension n before and after it is bent. When the blank isplaced in the dies, as shown in Fig. 9, and the plunger driven to the position shown, the operator turns the portion 91 over onto the anvil-horn by means of a hammer or other suitable tool, and forms by this manipulation the under lip. The dies are then parted, the blank turned so as to present the other extension n, and the blank is again clamped. The dies are then closed and the plunger forced to its seat, and the lip will be turned in the same manner as the opposite lip.

A spur may be formed by cutting out the portion 7a in the plunger and turning the lip up instead of down; or by a vertical pressure both the. spur and the lip may be formed as shown in Fig. 16.

- In everycase the anvil-horn is used, whether the lip is forced over the anvil by the plunger,- as shown in Figs. T-and 8., or whether forced by arms, (shown in Figs. 12 and13,) or by hand manipulatiom-als shown in Figs. 9, 10,-"and 11.

I claim as my invention- 1. In dies for forming the heads of angers or bits, one ofsaid dies. having a projecting anvil-horn and the opposite die: having a-recess adapted to receive saidhorn, said horn being of such shape thatthe under lip of an anger or bit can be formed thereon in said die, substantially asdescribed.

2. The combination ofthe. dies A- and B, one of. said dies having an anvil-horn d and the other dieha-ving a seat 0, adapted to support said horn, with a plunger adapted to'pass into the dies and act uponthe head ofan auger-blank to form theaunderlip-thereon,substantially as-described.

3. The combination of. they die A, with its projecting anvil-horn d and itsseat c, with 'thedie B, an anvil-horn d thereon and a seat c,'tl1e horn of one eye being adapted to pass into a recess upon the side ofthe opposite die, with a plunger having a beveled face adapted to. outline the head ofv the anger or bit, substantially as described.

4. The combination of the two-part dies A and B, with the anvil-horns.thereon, with a plunger having thecorners h h at an angle to the parting-line of the dies, so: thatthe metal of the blank beingcompressed .will be free to flow laterally in respect to the blank, substantially as described.

5. The combination ofthe dies A-and B and a projecting anvil-horn oneach die with a-plunger D, adapted to foroethe-metal of the auger-blank over the an vil-horns forming the under lip, substantially as described.

In testimony whereof 'I have signed my" name to this specification in the presence of two subscribing witnesses.

- SETH A. LEONARD.

Witnesses:

M. B. DWIGHT, IIENRY lHOWSON. 

